---
title: "AR inbox: definition | Rex glossary"
description: "The shared mailbox where customers send remittances, invoice requests, disputes and questions to a company's accounts receivable team."
canonical: https://www.rex.inc/glossary/ar-inbox
---

# AR inbox

The shared mailbox where customers send remittances, invoice requests, disputes and questions to a company's accounts receivable team.

A busy AR inbox mixes routine requests, such as invoice copies, W-9s and statements, with messages that change what should happen next: a promise to pay, a dispute, a remittance or a new billing contact.

Triage matters because each message belongs to a different workflow. A remittance needs cash application, a dispute needs an owner, and a promise to pay should pause reminders.

How Rex helps

AR inbox

Customer emails triaged, answered or routed in minutes.

[See how it works](https://www.rex.inc/ar-inbox)

## Related terms

- [Remittance advice The details a customer sends with or alongside a payment, saying which invoices it covers and explaining any deductions.](https://www.rex.inc/resources/glossary/what-is-remittance-advice)
- [Promise to pay A customer's commitment to pay a specific amount by a specific date, recorded so collections can follow up if it's missed.](https://www.rex.inc/resources/glossary/what-is-a-promise-to-pay)
- [Invoice dispute A customer's objection to an invoice, for example to its price, quantity, terms or delivery, that holds up payment until it's resolved.](https://www.rex.inc/glossary/invoice-dispute)
- [W-9 form A US IRS form a supplier gives its customers to confirm its legal name and taxpayer identification number. Many AP teams won't pay without one.](https://www.rex.inc/glossary/w-9-form)

Next step

Accelerate your receivables operation with Rex

A short walkthrough of agents working your accounts under your guardrails, with your team on the exceptions.

[Learn more](https://www.rex.inc/learn-more)

[Back to the glossary](https://www.rex.inc/glossary)